diff --git a/convention.php b/convention.php
index 23408722..8eb30f43 100644
--- a/convention.php
+++ b/convention.php
@@ -105,6 +105,8 @@ return [
     'var_pjax'               => '_pjax',
     // 是否开启请求缓存 true自动缓存 支持设置请求缓存规则
     'request_cache'          => false,
+    // 请求缓存有效期
+    'request_cache_expire'   => null,
 
     // +----------------------------------------------------------------------
     // | 模板设置
diff --git a/library/think/App.php b/library/think/App.php
index 93d9ef6f..4eddc7cd 100644
--- a/library/think/App.php
+++ b/library/think/App.php
@@ -128,7 +128,7 @@ class App
             // 监听app_begin
             Hook::listen('app_begin', $dispatch);
             // 请求缓存检查
-            $request->cache($config['request_cache']);
+            $request->cache($config['request_cache'], $config['request_cache_expire']);
 
             switch ($dispatch['type']) {
                 case 'redirect':